Chables de hass



COMING on PLAsnc. cross Ramen@ 4CHARLES DE HSS, OF `WASHINGTO-N CITY,DISTRICTF CLUMB-IA.

Letters Patent No. 77,177, dated April l 28, 1868.

IMPROVD MODE 0F ROOFING BUILDINGS.

i @te tiphnlt tefertmtu in igrst btttrs ttent nnh'nmhing @art nf tigesame.

TO ALL WHOM ITMAY CONCERN:

Be it known that I, CHARLES DE HASS, of the city of Washington, andDistrict of Columbia, haveinvented a new Mode of Roofing Buildings,termed the Concrete Roong; and do hereby declarethat'th'e following is afull and exact description thereof, reference being had to theaccompanying draught of the same.'

Vthe preparation of the roof ofthe building, and the ingredients used incompounding the'oncrete for the rooiingmaterial, and the application ofthe same to the roof of the building.

for shingles. O'n this sheeting, rolled iron rails, of the T-form, halfan inch high, are inversely nailed, running from top to bottom of theroof, two and a half feetV usunder. These rails are designed for thedouble purpose oiiholding theconcrete in its position, and to enable theoperator to give a uniformthickness tothe roof.

, -|i cement and limghsllghtly moistened with water, heated, andthoroughly mixed.

of spreading mortar, between the two rst set of rails, filling theentire space between and to the top of the rails, and at the sameinstant compactly rolling the concrete with a heavy iron roller. Thisoperation is to be performed speedily on the remaining sections, as' theconcrete hardens very rapidly.

, purpose of making the roof still more impervious to water.

What I claim as my invention, and desire to securebyLetter's Patent, is-

A roof, constructed as herein described. l I v' Witnesses T. DRURY,

JOHN DEWDNE.

e c CHARLES DE HAss.

To enable others4 skilled in the art to make and use my invention inroofing buildings; I proceed to describe 'l The roof` of the building isarranged in the ordinary manner, and. slieetcd with inch plank, similarto that The concrete roofing-material 'n composed of three parts ofclear, sha1-p sand and one part each of hvdl'aulic After thepreparationof thenconcrete as indicated, it is to be spread by thcoperator, in the ordinary manner A thin'nishing-coat is now applied,composed of equal parte of clear, fine sand and :isp: haltum,for the-

